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        <ol class="chapter"><li><a href="../index.html"><strong aria-hidden="true">1.</strong> 超过 88 道练习，任点</a></li><li><a href="../low.html"><strong aria-hidden="true">2.</strong> 易</a></li><li><ol class="section"><li><a href="../hello-world/README.zh.html"><strong aria-hidden="true">2.1.</strong> hello world</a></li><li><a href="../gigasecond/README.zh.html"><strong aria-hidden="true">2.2.</strong> 千兆秒 &gt;&lt; Gigasecond)</a></li><li><a href="../leap/README.zh.html"><strong aria-hidden="true">2.3.</strong> 闰年 &gt;&lt; Leap</a></li><li><a href="../raindrops/README.zh.html"><strong aria-hidden="true">2.4.</strong> 雨滴声 &gt;&lt; Raindrops</a></li><li><a href="../reverse-string/README.zh.html"><strong aria-hidden="true">2.5.</strong> 反转字符串 &gt;&lt; Reverse String</a></li><li><a href="../nth-prime/README.zh.html"><strong aria-hidden="true">2.6.</strong> 第 n 个素数 &gt;&lt; Nth Prime</a></li><li><a href="../bob/README.zh.html"><strong aria-hidden="true">2.7.</strong> 迟钝孩子 &gt;&lt; Bob</a></li><li><a href="../beer-song/README.zh.html" class="active"><strong aria-hidden="true">2.8.</strong> 啤酒之歌 &gt;&lt; Beer Song</a></li><li><a href="../proverb/README.zh.html"><strong aria-hidden="true">2.9.</strong> 谚语串烧 &gt;&lt; Proverb</a></li><li><a href="../difference-of-squares/README.zh.html"><strong aria-hidden="true">2.10.</strong> 平方差 &gt;&lt; Difference Of Squares</a></li><li><a href="../sum-of-multiples/README.zh.html"><strong aria-hidden="true">2.11.</strong> 倍数之和 &gt;&lt; Sum Of Multiples</a></li><li><a href="../grains/README.zh.html"><strong aria-hidden="true">2.12.</strong> 谷物 &gt;&lt; Grains</a></li><li><a href="../pythagorean-triplet/README.zh.html"><strong aria-hidden="true">2.13.</strong> 勾股数 &gt;&lt; Pythagorean Triplet</a></li><li><a href="../prime-factors/README.zh.html"><strong aria-hidden="true">2.14.</strong> 素数因子 &gt;&lt; Prime Factors</a></li><li><a href="../series/README.zh.html"><strong aria-hidden="true">2.15.</strong> 子串 &gt;&lt; Series</a></li><li><a href="../armstrong-numbers/README.zh.html"><strong aria-hidden="true">2.16.</strong> 水仙花数 &gt;&lt; Armstrong Numbers</a></li><li><a href="../collatz-conjecture/README.zh.html"><strong aria-hidden="true">2.17.</strong> 3n+1 猜想 &gt;&lt; Collatz Conjecture</a></li><li><a href="../diffie-hellman/README.zh.html"><strong aria-hidden="true">2.18.</strong> 迪菲-赫尔曼密钥交换 &gt;&lt; Diffie Hellman</a></li></ol></li><li><a href="../medium.html"><strong aria-hidden="true">3.</strong> 中等</a></li><li><ol class="section"><li><a href="../saddle-points/README.zh.html"><strong aria-hidden="true">3.1.</strong> 鞍点 &gt;&lt; Saddle Points</a></li><li><a href="../isogram/README.zh.html"><strong aria-hidden="true">3.2.</strong> 等值线 &gt;&lt; Isogram</a></li><li><a href="../say/README.zh.html"><strong aria-hidden="true">3.3.</strong> 英文说数字 &gt;&lt; Say</a></li><li><a href="../run-length-encoding/README.zh.html"><strong aria-hidden="true">3.4.</strong> 游程编码 &gt;&lt; Run Length Encoding</a></li><li><a href="../isbn-verifier/README.zh.html"><strong aria-hidden="true">3.5.</strong> 图书编号 &gt;&lt; ISBN Verifier</a></li><li><a href="../perfect-numbers/README.zh.html"><strong aria-hidden="true">3.6.</strong> 数字也能分类 &gt;&lt; Perfect Numbers</a></li><li><a href="../clock/README.zh.html"><strong aria-hidden="true">3.7.</strong> 时钟 &gt;&lt; Clock</a></li><li><a href="../dot-dsl/README.zh.html"><strong aria-hidden="true">3.8.</strong> DOT DSL</a></li><li><a href="../hamming/README.zh.html"><strong aria-hidden="true">3.9.</strong> 汉明距离 &gt;&lt; Hamming</a></li><li><a href="../simple-linked-list/README.zh.html"><strong aria-hidden="true">3.10.</strong> 简单链表 &gt;&lt; Simple Linked List</a></li><li><a href="../pascals-triangle/README.zh.html"><strong aria-hidden="true">3.11.</strong> 杨辉三角形 &gt;&lt; Pascal's Triangle</a></li><li><a href="../scrabble-score/README.zh.html"><strong aria-hidden="true">3.12.</strong> 字母的分数游戏 &gt;&lt; Scrabble Score</a></li><li><a href="../pangram/README.zh.html"><strong aria-hidden="true">3.13.</strong> 全字母句 &gt;&lt; Pangram</a></li><li><a href="../paasio/README.zh.html"><strong aria-hidden="true">3.14.</strong> PaaS-IO-报告 &gt;&lt; Paasio</a></li><li><a href="../nucleotide-count/README.zh.html"><strong aria-hidden="true">3.15.</strong> 核苷酸计数 &gt;&lt; Nucleotide Count</a></li><li><a href="../luhn/README.zh.html"><strong aria-hidden="true">3.16.</strong> 模 10 算法 &gt;&lt; Luhn</a></li><li><a href="../largest-series-product/README.zh.html"><strong aria-hidden="true">3.17.</strong> 最大数字子串乘积 &gt;&lt; Largest Series Product</a></li><li><a href="../word-count/README.zh.html"><strong aria-hidden="true">3.18.</strong> 单词计数 &gt;&lt; Word Count</a></li><li><a href="../atbash-cipher/README.zh.html"><strong aria-hidden="true">3.19.</strong> Atbash 加密 &gt;&lt; Atbash Cipher</a></li><li><a href="../crypto-square/README.zh.html"><strong aria-hidden="true">3.20.</strong> 密码矩形 &gt;&lt; Crypto Square</a></li><li><a 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                    <a class="header" href="#啤酒之歌-beer-song" id="啤酒之歌-beer-song"><h1>啤酒之歌-Beer Song</h1></a>
<a class="header" href="#1-readme" id="1-readme"><h2>1. Readme</h2></a>
<a class="header" href="#啤酒之歌" id="啤酒之歌"><h1>啤酒之歌</h1></a>
<p>背诵那首备受喜爱的经典歌词,即去实地考察时的最爱: 墙上的 99 瓶啤酒.</p>
<p>请注意,并非所有歌词都相同.</p>
<pre><code class="language-text">99 bottles of beer on the wall, 99 bottles of beer.
Take one down and pass it around, 98 bottles of beer on the wall.

98 bottles of beer on the wall, 98 bottles of beer.
Take one down and pass it around, 97 bottles of beer on the wall.

97 bottles of beer on the wall, 97 bottles of beer.
Take one down and pass it around, 96 bottles of beer on the wall.

96 bottles of beer on the wall, 96 bottles of beer.
Take one down and pass it around, 95 bottles of beer on the wall.

95 bottles of beer on the wall, 95 bottles of beer.
Take one down and pass it around, 94 bottles of beer on the wall.

94 bottles of beer on the wall, 94 bottles of beer.
Take one down and pass it around, 93 bottles of beer on the wall.

93 bottles of beer on the wall, 93 bottles of beer.
Take one down and pass it around, 92 bottles of beer on the wall.

92 bottles of beer on the wall, 92 bottles of beer.
Take one down and pass it around, 91 bottles of beer on the wall.

91 bottles of beer on the wall, 91 bottles of beer.
Take one down and pass it around, 90 bottles of beer on the wall.

90 bottles of beer on the wall, 90 bottles of beer.
Take one down and pass it around, 89 bottles of beer on the wall.

89 bottles of beer on the wall, 89 bottles of beer.
Take one down and pass it around, 88 bottles of beer on the wall.

88 bottles of beer on the wall, 88 bottles of beer.
Take one down and pass it around, 87 bottles of beer on the wall.

87 bottles of beer on the wall, 87 bottles of beer.
Take one down and pass it around, 86 bottles of beer on the wall.

86 bottles of beer on the wall, 86 bottles of beer.
Take one down and pass it around, 85 bottles of beer on the wall.

85 bottles of beer on the wall, 85 bottles of beer.
Take one down and pass it around, 84 bottles of beer on the wall.

84 bottles of beer on the wall, 84 bottles of beer.
Take one down and pass it around, 83 bottles of beer on the wall.

83 bottles of beer on the wall, 83 bottles of beer.
Take one down and pass it around, 82 bottles of beer on the wall.

82 bottles of beer on the wall, 82 bottles of beer.
Take one down and pass it around, 81 bottles of beer on the wall.

81 bottles of beer on the wall, 81 bottles of beer.
Take one down and pass it around, 80 bottles of beer on the wall.

80 bottles of beer on the wall, 80 bottles of beer.
Take one down and pass it around, 79 bottles of beer on the wall.

79 bottles of beer on the wall, 79 bottles of beer.
Take one down and pass it around, 78 bottles of beer on the wall.

78 bottles of beer on the wall, 78 bottles of beer.
Take one down and pass it around, 77 bottles of beer on the wall.

77 bottles of beer on the wall, 77 bottles of beer.
Take one down and pass it around, 76 bottles of beer on the wall.

76 bottles of beer on the wall, 76 bottles of beer.
Take one down and pass it around, 75 bottles of beer on the wall.

75 bottles of beer on the wall, 75 bottles of beer.
Take one down and pass it around, 74 bottles of beer on the wall.

74 bottles of beer on the wall, 74 bottles of beer.
Take one down and pass it around, 73 bottles of beer on the wall.

73 bottles of beer on the wall, 73 bottles of beer.
Take one down and pass it around, 72 bottles of beer on the wall.

72 bottles of beer on the wall, 72 bottles of beer.
Take one down and pass it around, 71 bottles of beer on the wall.

71 bottles of beer on the wall, 71 bottles of beer.
Take one down and pass it around, 70 bottles of beer on the wall.

70 bottles of beer on the wall, 70 bottles of beer.
Take one down and pass it around, 69 bottles of beer on the wall.

69 bottles of beer on the wall, 69 bottles of beer.
Take one down and pass it around, 68 bottles of beer on the wall.

68 bottles of beer on the wall, 68 bottles of beer.
Take one down and pass it around, 67 bottles of beer on the wall.

67 bottles of beer on the wall, 67 bottles of beer.
Take one down and pass it around, 66 bottles of beer on the wall.

66 bottles of beer on the wall, 66 bottles of beer.
Take one down and pass it around, 65 bottles of beer on the wall.

65 bottles of beer on the wall, 65 bottles of beer.
Take one down and pass it around, 64 bottles of beer on the wall.

64 bottles of beer on the wall, 64 bottles of beer.
Take one down and pass it around, 63 bottles of beer on the wall.

63 bottles of beer on the wall, 63 bottles of beer.
Take one down and pass it around, 62 bottles of beer on the wall.

62 bottles of beer on the wall, 62 bottles of beer.
Take one down and pass it around, 61 bottles of beer on the wall.

61 bottles of beer on the wall, 61 bottles of beer.
Take one down and pass it around, 60 bottles of beer on the wall.

60 bottles of beer on the wall, 60 bottles of beer.
Take one down and pass it around, 59 bottles of beer on the wall.

59 bottles of beer on the wall, 59 bottles of beer.
Take one down and pass it around, 58 bottles of beer on the wall.

58 bottles of beer on the wall, 58 bottles of beer.
Take one down and pass it around, 57 bottles of beer on the wall.

57 bottles of beer on the wall, 57 bottles of beer.
Take one down and pass it around, 56 bottles of beer on the wall.

56 bottles of beer on the wall, 56 bottles of beer.
Take one down and pass it around, 55 bottles of beer on the wall.

55 bottles of beer on the wall, 55 bottles of beer.
Take one down and pass it around, 54 bottles of beer on the wall.

54 bottles of beer on the wall, 54 bottles of beer.
Take one down and pass it around, 53 bottles of beer on the wall.

53 bottles of beer on the wall, 53 bottles of beer.
Take one down and pass it around, 52 bottles of beer on the wall.

52 bottles of beer on the wall, 52 bottles of beer.
Take one down and pass it around, 51 bottles of beer on the wall.

51 bottles of beer on the wall, 51 bottles of beer.
Take one down and pass it around, 50 bottles of beer on the wall.

50 bottles of beer on the wall, 50 bottles of beer.
Take one down and pass it around, 49 bottles of beer on the wall.

49 bottles of beer on the wall, 49 bottles of beer.
Take one down and pass it around, 48 bottles of beer on the wall.

48 bottles of beer on the wall, 48 bottles of beer.
Take one down and pass it around, 47 bottles of beer on the wall.

47 bottles of beer on the wall, 47 bottles of beer.
Take one down and pass it around, 46 bottles of beer on the wall.

46 bottles of beer on the wall, 46 bottles of beer.
Take one down and pass it around, 45 bottles of beer on the wall.

45 bottles of beer on the wall, 45 bottles of beer.
Take one down and pass it around, 44 bottles of beer on the wall.

44 bottles of beer on the wall, 44 bottles of beer.
Take one down and pass it around, 43 bottles of beer on the wall.

43 bottles of beer on the wall, 43 bottles of beer.
Take one down and pass it around, 42 bottles of beer on the wall.

42 bottles of beer on the wall, 42 bottles of beer.
Take one down and pass it around, 41 bottles of beer on the wall.

41 bottles of beer on the wall, 41 bottles of beer.
Take one down and pass it around, 40 bottles of beer on the wall.

40 bottles of beer on the wall, 40 bottles of beer.
Take one down and pass it around, 39 bottles of beer on the wall.

39 bottles of beer on the wall, 39 bottles of beer.
Take one down and pass it around, 38 bottles of beer on the wall.

38 bottles of beer on the wall, 38 bottles of beer.
Take one down and pass it around, 37 bottles of beer on the wall.

37 bottles of beer on the wall, 37 bottles of beer.
Take one down and pass it around, 36 bottles of beer on the wall.

36 bottles of beer on the wall, 36 bottles of beer.
Take one down and pass it around, 35 bottles of beer on the wall.

35 bottles of beer on the wall, 35 bottles of beer.
Take one down and pass it around, 34 bottles of beer on the wall.

34 bottles of beer on the wall, 34 bottles of beer.
Take one down and pass it around, 33 bottles of beer on the wall.

33 bottles of beer on the wall, 33 bottles of beer.
Take one down and pass it around, 32 bottles of beer on the wall.

32 bottles of beer on the wall, 32 bottles of beer.
Take one down and pass it around, 31 bottles of beer on the wall.

31 bottles of beer on the wall, 31 bottles of beer.
Take one down and pass it around, 30 bottles of beer on the wall.

30 bottles of beer on the wall, 30 bottles of beer.
Take one down and pass it around, 29 bottles of beer on the wall.

29 bottles of beer on the wall, 29 bottles of beer.
Take one down and pass it around, 28 bottles of beer on the wall.

28 bottles of beer on the wall, 28 bottles of beer.
Take one down and pass it around, 27 bottles of beer on the wall.

27 bottles of beer on the wall, 27 bottles of beer.
Take one down and pass it around, 26 bottles of beer on the wall.

26 bottles of beer on the wall, 26 bottles of beer.
Take one down and pass it around, 25 bottles of beer on the wall.

25 bottles of beer on the wall, 25 bottles of beer.
Take one down and pass it around, 24 bottles of beer on the wall.

24 bottles of beer on the wall, 24 bottles of beer.
Take one down and pass it around, 23 bottles of beer on the wall.

23 bottles of beer on the wall, 23 bottles of beer.
Take one down and pass it around, 22 bottles of beer on the wall.

22 bottles of beer on the wall, 22 bottles of beer.
Take one down and pass it around, 21 bottles of beer on the wall.

21 bottles of beer on the wall, 21 bottles of beer.
Take one down and pass it around, 20 bottles of beer on the wall.

20 bottles of beer on the wall, 20 bottles of beer.
Take one down and pass it around, 19 bottles of beer on the wall.

19 bottles of beer on the wall, 19 bottles of beer.
Take one down and pass it around, 18 bottles of beer on the wall.

18 bottles of beer on the wall, 18 bottles of beer.
Take one down and pass it around, 17 bottles of beer on the wall.

17 bottles of beer on the wall, 17 bottles of beer.
Take one down and pass it around, 16 bottles of beer on the wall.

16 bottles of beer on the wall, 16 bottles of beer.
Take one down and pass it around, 15 bottles of beer on the wall.

15 bottles of beer on the wall, 15 bottles of beer.
Take one down and pass it around, 14 bottles of beer on the wall.

14 bottles of beer on the wall, 14 bottles of beer.
Take one down and pass it around, 13 bottles of beer on the wall.

13 bottles of beer on the wall, 13 bottles of beer.
Take one down and pass it around, 12 bottles of beer on the wall.

12 bottles of beer on the wall, 12 bottles of beer.
Take one down and pass it around, 11 bottles of beer on the wall.

11 bottles of beer on the wall, 11 bottles of beer.
Take one down and pass it around, 10 bottles of beer on the wall.

10 bottles of beer on the wall, 10 bottles of beer.
Take one down and pass it around, 9 bottles of beer on the wall.

9 bottles of beer on the wall, 9 bottles of beer.
Take one down and pass it around, 8 bottles of beer on the wall.

8 bottles of beer on the wall, 8 bottles of beer.
Take one down and pass it around, 7 bottles of beer on the wall.

7 bottles of beer on the wall, 7 bottles of beer.
Take one down and pass it around, 6 bottles of beer on the wall.

6 bottles of beer on the wall, 6 bottles of beer.
Take one down and pass it around, 5 bottles of beer on the wall.

5 bottles of beer on the wall, 5 bottles of beer.
Take one down and pass it around, 4 bottles of beer on the wall.

4 bottles of beer on the wall, 4 bottles of beer.
Take one down and pass it around, 3 bottles of beer on the wall.

3 bottles of beer on the wall, 3 bottles of beer.
Take one down and pass it around, 2 bottles of beer on the wall.

2 bottles of beer on the wall, 2 bottles of beer.
Take one down and pass it around, 1 bottle of beer on the wall.

1 bottle of beer on the wall, 1 bottle of beer.
Take it down and pass it around, no more bottles of beer on the wall.

No more bottles of beer on the wall, no more bottles of beer.
Go to the store and buy some more, 99 bottles of beer on the wall.
</code></pre>
<a class="header" href="#加分" id="加分"><h2>加分</h2></a>
<p>你是否通过了测试，并且代码干净了? 如果您愿意,可以尝试以下加分项:</p>
<ul>
<li>尽可能多地删除重复.</li>
<li>优化可读性,即使它意味着引入重复.</li>
<li>如果您删除了所有重复项,那么您是否有很多条件? 如果它适用于这种语言,请尝试用多态替换条件语句。它的可读性如何?</li>
</ul>
<p>那么请在提交的评论中，分享您的想法.这个实验是否让代码更好? 更差?你从中学到了什么?</p>
<a class="header" href="#source" id="source"><h2>Source</h2></a>
<p>Learn to Program by Chris Pine <a href="http://pine.fm/LearnToProgram/?Chapter=06">http://pine.fm/LearnToProgram/?Chapter=06</a></p>
<a class="header" href="#2-开始你的表演" id="2-开始你的表演"><h2>2. 开始你的表演</h2></a>
<pre><pre class="playpen"><code class="language-rust editable">pub fn verse(n: i32) -&gt; String {
   unimplemented!(&quot;emit verse {}&quot;, n)
}

pub fn sing(start: i32, end: i32) -&gt; String {
   unimplemented!(&quot;sing verses {} to {}, inclusive&quot;, start, end)
}

</code></pre></pre>
<a class="header" href="#3-测试代码查看" id="3-测试代码查看"><h2>3. 测试代码查看</h2></a>
<pre><pre class="playpen"><code class="language-rust">
# #![allow(unused_variables)]
#fn main() {
#[test]
fn test_verse_0() {
   assert_eq!(verse(0), &quot;No more bottles of beer on the wall, no more bottles of beer.\nGo to the store and buy some more, 99 bottles of beer on the wall.\n&quot;);
}

#[test]
//#[ignore]
fn test_verse_1() {
   assert_eq!(verse(1), &quot;1 bottle of beer on the wall, 1 bottle of beer.\nTake it down and pass it around, no more bottles of beer on the wall.\n&quot;);
}

#[test]
//#[ignore]
fn test_verse_2() {
   assert_eq!(verse(2), &quot;2 bottles of beer on the wall, 2 bottles of beer.\nTake one down and pass it around, 1 bottle of beer on the wall.\n&quot;);
}

#[test]
//#[ignore]
fn test_verse_8() {
   assert_eq!(verse(8), &quot;8 bottles of beer on the wall, 8 bottles of beer.\nTake one down and pass it around, 7 bottles of beer on the wall.\n&quot;);
}

#[test]
//#[ignore]
fn test_song_8_6() {
   assert_eq!(sing(8, 6), &quot;8 bottles of beer on the wall, 8 bottles of beer.\nTake one down and pass it around, 7 bottles of beer on the wall.\n\n7 bottles of beer on the wall, 7 bottles of beer.\nTake one down and pass it around, 6 bottles of beer on the wall.\n\n6 bottles of beer on the wall, 6 bottles of beer.\nTake one down and pass it around, 5 bottles of beer on the wall.\n&quot;);
}

#[test]
//#[ignore]
fn test_song_3_0() {
   assert_eq!(sing(3, 0), &quot;3 bottles of beer on the wall, 3 bottles of beer.\nTake one down and pass it around, 2 bottles of beer on the wall.\n\n2 bottles of beer on the wall, 2 bottles of beer.\nTake one down and pass it around, 1 bottle of beer on the wall.\n\n1 bottle of beer on the wall, 1 bottle of beer.\nTake it down and pass it around, no more bottles of beer on the wall.\n\nNo more bottles of beer on the wall, no more bottles of beer.\nGo to the store and buy some more, 99 bottles of beer on the wall.\n&quot;);
}

#}</code></pre></pre>
<a class="header" href="#4-答案" id="4-答案"><h2>4. 答案</h2></a>
<p><details></p>
<pre><pre class="playpen"><code class="language-rust">
# #![allow(unused_variables)]
#fn main() {
pub fn verse(n: i32) -&gt; String {
   match n {
       0 =&gt; &quot;No more bottles of beer on the wall, no more bottles of beer.\n\
             Go to the store and buy some more, 99 bottles of beer on the wall.\n&quot;
           .to_string(),
       1 =&gt; &quot;1 bottle of beer on the wall, 1 bottle of beer.\n\
             Take it down and pass it around, no more bottles of beer on the wall.\n&quot;
           .to_string(),
       2 =&gt; &quot;2 bottles of beer on the wall, 2 bottles of beer.\n\
             Take one down and pass it around, 1 bottle of beer on the wall.\n&quot;
           .to_string(),
       n if n &gt; 2 &amp;&amp; n &lt;= 99 =&gt; format!(
           &quot;{n} bottles of beer on the wall, {n} bottles of beer.\n\
            Take one down and pass it around, {n_minus_1} bottles of beer on the wall.\n&quot;,
           n = n,
           n_minus_1 = n - 1
       ),
       _ =&gt; panic!(),
   }
}

pub fn sing(start: i32, end: i32) -&gt; String {
   (end..start + 1)
       .rev()
       .map(|n| verse(n))
       .collect::&lt;Vec&lt;_&gt;&gt;()
       .join(&quot;\n&quot;)
}

#}</code></pre></pre>
<p></details></p>
<hr />
<hr />
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